Submission #145392

#	Time	Username	Problem	Language	Result	Execution time	Memory
145392		mohammedehab2002	Ancient Books (IOI17_books)	C++11	0 / 100	2 ms	376 KiB

books

#include "books.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> p;
bool vis[1000005];
void dfs(int i)
{
	vis[i]=1;
	if (!vis[p[i]])
	dfs(p[i]);
}
long long minimum_walk(vector<int> pp,int s)
{
	p=pp;
	while (!p.empty() && p.back()+1==p.size())
	p.pop_back();
	int n=p.size();
	if (!n)
	return 0;
	long long ans=-2;
	for (int i=0;i<n;i++)
	{
		ans+=abs(p[i]-i);
		if (!vis[i])
		{
			dfs(i);
			ans+=2;
		}
	}
	return ans;
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:15:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while (!p.empty() && p.back()+1==p.size())
                       ~~~~~~~~~~^~~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 10
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 30